Shares of Five9 surged as much as 20% on August 7, hitting a new 52-week high, as investors reversed an initial post-earnings sell-off and piled into a quarter that delivered accelerating growth on nearly every front. The stock is now up 81.5% year-to-date , yet investors who bought $1,000 worth five years ago are sitting on just $170 — a reminder of how far the cloud contact-center company fell before this turnaround began.

The Numbers That Flipped Sentiment Overnight

Five9 posted $312 million in Q2 revenue, up 10% year-over-year, beating the high end of guidance — yet shares initially fell 4.3% in regular trading and slipped further after hours. By the next morning, buyers overwhelmed sellers. The catalyst: AI revenue surged 78% year-over-year, prompting management to raise its full-year AI growth forecast from over 40% to at least 60%.

Subscription revenue — the recurring, high-value portion of Five9's business — rose 14%, marking a third straight quarter of acceleration.

A $100 Million Deal Shows Google's Selling Power

Five9 closed a Fortune 100 financial services deal worth roughly $100 million in total contract value — its first full-size win transacted through the Google Cloud Marketplace.

The contract is expected to ramp to $25 million in annual recurring revenue (yearly subscription income). The deal uses Five9's newer revenue-commit model, letting the customer shift its mix between human agent seats and AI agents over the contract's life — a structure that bets the ratio will keep tilting toward automation.

Margins Are the Trade-Off Investors Must Watch

Adjusted EBITDA margin — a measure of profitability before certain accounting costs — compressed to 22% from 24% a year earlier, and free cash flow declined 30% to $15 million.

Management expects full-year margins above 24% and roughly $175 million in free cash flow , but near-term spending on AI development and three new C-suite hires is squeezing profits now.

Guidance Leans on Backlog, Not Hope

Five9 raised its full-year revenue outlook to a midpoint of $1.266 billion . CFO Bryan Lee said the guidance has "essentially no dependency" on new customer wins, relying instead on converting existing backlog to revenue — a lower-risk posture that gives the raised forecast more credibility. Analysts' average 12-month price target sits at $27.95 , well below today's price, suggesting the market is now pricing in AI upside that Wall Street models haven't yet captured.